My colour keeps moving whenever I make a penstroke with the ink pen from black to grey to white, sometimes just straight to white. I don't know why and I can't figure out for the life of me which setting can fix it. I'm just an HP tilt pen and Art Rage is the only program that accepts its pressure sensors. I have a lot of work to do before my book launch on March 25th and I desperately need this fixed. Please help!